[rinjanianalytics]

An address like /docs/unknown is served by the documentation page, not by the not found page. It showed an empty table of contents and a red box with no way out.

• When the server answers 404 for a document, the documentation page shows the same view as the not found page: "This document does not exist", with links to the home page and to the documentation.
• The title of the tab says "Not found".
• Other errors keep the red box.
• The view is one component, shared by both pages.

Checks

• pnpm lint, pnpm test and pnpm build pass. The built 404.html still has its title and its text.
• In a browser, with the development server and the data of the demo: opened /docs/0, followed "Open the documentation" (the introduction opens), went back (the view returns), followed "Back to home".

Not checked

• An error other than 404 from the documentation endpoint.